Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bc28b6dba2ac89…

MALICIOUS

PDF

71.9 KB Created: 2021-09-09 15:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 79151a6219e838222f320868e08dcf54 SHA-1: e2bfe75e5e3a5b28353844510cc8cbffbf8b0f35 SHA-256: b9bc28b6dba2ac890107c61178323e727e40e3e76e31a843a209c9da463f68c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards a tactic of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://hostsolutions.ro/app/webroot/files/userfiles/files/mafek.pdf In PDF document text
    • https://marupyara.com/fotos/userfiles/file/lakujefogasakolex.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/24877172032.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/biwuf.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/dumenodol.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/rokafubazoxevaj.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219811734.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109030401244406.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/43894323120.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/pupubizemukegoxezov.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613456665632b---62362377084.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d9e9bc620---18984472826.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/58106048004.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/fc488d6c42e76f42362c5df8b8c1d59f/79163121686.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac3a2b40d---juxoparukazapiwavabada.pdfIn PDF document text
    • http://spakimthi.com/upload/files/jafajonuwabeseledave.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/16995082098.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613390ce4aaaa---64654679423.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132fac3cac4c---56664828818.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/47563455427.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/47637575933.pdfIn PDF document text
    • https://alutat.com/data/file/74705651785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=subway+surfers+earn+money+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86B 10840 bytes
SHA-256: cbe20bf48c9d172dda23b999fe28e0e3e19dddd4043c5c32e645f4477c4ca9a5
font_01_sfnt_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 15928 bytes
SHA-256: 82469d32c26e4b5492e7436ec9c1b36e2ec6ac23acd938e3833caddae3f6b19d
font_02_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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